CN111963281B - High-efficient blender of diesel engine aftertreatment - Google Patents
High-efficient blender of diesel engine aftertreatment Download PDFInfo
- Publication number
- CN111963281B CN111963281B CN202010759592.0A CN202010759592A CN111963281B CN 111963281 B CN111963281 B CN 111963281B CN 202010759592 A CN202010759592 A CN 202010759592A CN 111963281 B CN111963281 B CN 111963281B
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- China
- Prior art keywords
- mixing
- pipe
- tube
- urea
- inner pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000002156 mixing Methods 0.000 claims abstract description 91
- 239000004202 carbamide Substances 0.000 claims abstract description 39
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000005219 brazing Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 abstract description 5
- 230000008025 crystallization Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 239000003638 chemical reducing agent Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 17
- 239000000243 solution Substances 0.000 description 11
- 239000003054 catalyst Substances 0.000 description 9
- 239000002912 waste gas Substances 0.000 description 7
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a diesel engine aftertreatment efficient mixer, which comprises a cylinder, wherein two ends of the cylinder are respectively provided with an air inlet and an air outlet, a mixing outer pipe, a middle pipe and a mixing inner pipe are coaxially arranged in the cylinder in sequence from outside to inside, wherein the axis of the cylinder is vertical to the axis of the cylinder; the middle pipe and the mixing inner pipe are respectively arranged at two ends of the mixing outer pipe, and the tail end of the mixing inner pipe extends into the tail end of the middle pipe; an opening which is communicated with a gap between the mixing outer tube and the middle tube is arranged on the side wall of the lower part of the mixing outer tube and is communicated with the air inlet; a swirl plate is arranged between the middle pipe and the mixing inner pipe, and a through hole is arranged on the wall surface of the mixing inner pipe far away from the middle pipe; the urea spraying nozzle for spraying urea into the inner pipe is arranged on the cylinder body, the silk screen is arranged at the bottom of the middle pipe, and the channel communicated with the silk screen and the air outlet is arranged below the mixing outer pipe. The invention can fully and uniformly mix the reducing agent and the exhaust of the engine, enhance the mixing effect and avoid the crystallization of urea in the mixer.
Description
Technical Field
The invention relates to the technical field of engine parts, in particular to a diesel engine aftertreatment efficient mixer.
Background
The main purification part for NOx in the tail gas of the diesel engine is an SCR catalyst, a mixer is arranged in front of the SCR catalyst, and a urea nozzle is arranged on the mixer. The urea injection system calculates the required urea dosage according to the temperature condition of the SCR catalyst, the working condition of the diesel engine and the like, and injects the urea solution for the vehicle into the mixer through the nozzle, the urea solution is decomposed into NH3 at high temperature, the NH3 is fully mixed with the high-temperature tail gas of the diesel engine, enters the SCR catalyst, reacts with NOx in the catalyst to generate N2 and H20, and the purification of NOx is realized.
At present, a common mixer is as in patent CN201910600550.X, which changes the flow characteristics of air flow by utilizing pipe diameter change, and improves the mixing uniformity of urea and exhaust gas; for example, in the CN201811390687.9 patent, a front stage cyclone mixer is designed in front of the nozzle, a rear stage mixer is designed at a proper position at the rear end of the nozzle, and the front stage cyclone mixer forms a rotating air flow, so that urea and waste gas are mixed, rapid endothermic decomposition of urea droplets is promoted, and the urea droplets are not in direct contact with the front stage cyclone mixer, so that the crystallization risk caused by the adhesion of the urea droplets on the front stage cyclone mixer is avoided.
However, the urea injection quantity is large under the state of low rotation speed in the six stages of the existing diesel engine, the flow speed of the air flow of the reducing or cyclone mixer is uneven, and the area with low flow speed is easy to form crystallization.
Disclosure of Invention
Aiming at the prior defects, the invention aims to provide a diesel engine post-treatment efficient mixer, so that a reducing agent and engine exhaust are fully and uniformly mixed, the mixing effect is enhanced, and urea is prevented from crystallizing in the mixer.
The technical scheme of the invention is as follows:
the high-efficiency mixer for the post-treatment of the diesel engine comprises a cylinder body, wherein an air inlet and an air outlet are respectively arranged at two ends of the cylinder body, and a mixing outer pipe, a middle pipe and a mixing inner pipe are coaxially arranged in the cylinder body from outside to inside in sequence, wherein the axis of the cylinder body is vertical to the axis of the cylinder body; the middle pipe and the mixing inner pipe are respectively arranged at two ends of the mixing outer pipe, the tail end of the mixing inner pipe extends into the tail end of the middle pipe, and gaps are formed among the mixing outer pipe, the middle pipe and the mixing inner pipe; the side wall of the lower part of the mixing outer pipe is provided with an opening which is communicated with a gap between the mixing outer pipe and the middle pipe, and the opening is communicated with the air inlet; a swirl plate is arranged in a gap between the middle pipe and the mixing inner pipe, and a through hole is formed in the wall surface of the mixing inner pipe, which corresponds to the upper part of the middle pipe; the urea spraying device is characterized in that a urea nozzle used for spraying urea into the inner pipe is arranged on the cylinder body, a silk screen is arranged at the bottom of the middle pipe, a channel communicated with the air outlet is arranged below the mixing outer pipe, and the silk screen is located above the channel.
Specifically, the through holes are arranged on the wall surfaces of the left side and the right side of the mixing inner pipe and respectively face the air inlet and the air outlet, and the left side of the through holes are positioned above the opening.
Specifically, the through holes are arranged as more than two groups of vertical holes, and the aperture size of the through holes is 3-10 mm.
Specifically, the diameter ratio of the mixing outer tube, the middle tube and the mixing inner tube is 3:2:1.
Specifically, the outer mixing pipe, the middle pipe and the inner mixing pipe are integrally formed.
Specifically, the silk screen is formed by pressing at least two layers of stainless steel wires which are woven in a staggered mode.
Specifically, the wire mesh is connected with the bottom of the middle pipe through brazing.
The invention has the beneficial effects that:
1. the scheme is that the mixing outer pipe, the middle pipe and the mixing inner pipe are arranged on the mixer, tail gas is enabled to enter the mixing inner pipe through the through hole to be mixed with NH3, the other path of tail gas is enabled to pass through the swirl plate on the periphery of the mixing inner pipe to generate rotary air flow to enter the mixing inner pipe cavity, the NH3 and the tail gas are driven to be further and fully mixed and then enter the silk screen, the NH3 and the high-temperature tail gas are enabled to quickly pass through the small holes to avoid crystallization, the mixed tail pipe is discharged through the rear guide plate, the uniformity of air flow velocity is promoted through two paths of air flow, the effect of fully mixing a reducing agent and engine exhaust is achieved, and crystallization of urea in the mixer is avoided.
Drawings
Fig. 1 is a cross-sectional view of a diesel aftertreatment high efficiency mixer in accordance with the present invention.
In the figure, a 1-cylinder, a 2-mixing outer tube, a 3-air inlet, a 4-air outlet, a 5-middle tube, a 6-mixing inner tube, a 7-through hole, an 8-swirl plate, a 9-urea nozzle, a 10-opening and an 11-silk screen are arranged.
Detailed Description
To describe the technical contents, the achieved objects and effects of the present invention in detail, the following description is made with reference to the embodiments in conjunction with the accompanying drawings. In the description of the embodiments, it should be understood that terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience in describing the embodiments and simplifying the description, and are not intended to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation and therefore should not be construed as limiting the invention.
As shown in fig. 1, the diesel engine aftertreatment efficient mixer according to the embodiment of the present embodiment includes a cylinder 1, a mixing outer tube 2, a middle tube 5, a mixing inner tube 6, a urea nozzle 9, and a wire mesh 11.
The left end and the right end of the cylinder body 1 are respectively provided with an air inlet 3 and an air outlet 4, the axis of the cylinder body 1 is vertical, and the mixing outer pipe 2, the middle pipe 5 and the mixing inner pipe 6 are coaxially arranged in sequence from outside to inside; the mixing inner pipe 6 and the middle pipe 5 are respectively arranged at the upper end and the lower end of the mixing outer pipe 2, the tail end part of the mixing inner pipe 6 extends into the tail end of the middle pipe 5, and the mixing outer pipe 2, the middle pipe 5 and the mixing inner pipe 6 are arranged in a clearance way; the side wall of the lower part of the mixing outer tube 2 is provided with an opening 10 which is communicated with a gap between the mixing outer tube 2 and the middle tube 5, and the opening 10 is communicated with the air inlet 3; a swirl plate 8 is arranged between the middle pipe 5 and the mixing inner pipe 6, and a through hole 7 is arranged on the wall surface of the mixing inner pipe 6 far away from the middle pipe 5; the urea spraying device is characterized in that the urea spraying nozzle 9 for spraying urea into the inner pipe 5 is arranged on the cylinder body 1, the silk screen 11 is arranged at the bottom of the middle pipe 5, a channel communicated with the air outlet 4 is arranged below the mixing outer pipe 2, and the silk screen 11 is positioned above the channel.
When the diesel engine works, the urea injection system calculates the required urea dosage according to the temperature condition of the SCR catalyst, the working condition of the diesel engine and the like, and the urea solution for the vehicle is injected into the mixer through the nozzle. The urea solution is decomposed into NH3 at high temperature and is contacted with the high-temperature tail gas of the diesel engine. Fig. 1 shows the general flowing direction of the air flow when the mixer of the embodiment works, the trend of the air flow is shown by an arrow in fig. 1, the waste gas enters from the left side air inlet 3 of the cylinder body 1 and flows through the gap between the mixing outer pipe 2 and the middle pipe 5, at the moment, the air flow is divided into two paths, one path of waste gas enters into the mixing inner pipe 6 from one side of the gap from bottom to top through the through hole 7, the urea solution is sprayed into the mixing inner pipe 6 from top to bottom by the urea nozzle 9, the waste gas and the urea solution form opposite impact mixing, and then flow downwards to the lower part of the middle pipe 5; the other way of waste gas enters the gap between the middle pipe 5 and the mixing inner pipe 6 from the gap between the mixing outer pipe 2 and the middle pipe 5, generates rotary airflow through the obliquely arranged cyclone plate 8, and enters the lower part of the middle pipe 5 to be further mixed with waste gas and urea solution. Because one path of gas collides with urea solution, the other path of gas forms rotational flow, and the two paths of gas flow promote air intake
The flow velocity is uniform, the urea passes through a path which is high-temperature tail gas flowing at high speed, and the urea cannot stay and crystallize, so that the effect of fully mixing the reducing agent and the exhaust gas of the engine is achieved, and the purpose of the invention is achieved; urea and tail gas are further mixed, enter a silk screen 11 at the lower part of the intermediate pipe 5, gas flows through the silk screen 11 and enters a channel at the bottom of the mixing outer pipe 2, then flows out of the mixer from an air outlet 4 at the side surface of the cylinder body 1, NH3 and tail gas are evenly mixed and then enter the SCR catalyst from the mixer, NH3 and NOx are catalytically reacted in the SCR catalyst unit to generate N2 and H20 through the catalyst, and NOx is purified.
As a preferable solution of this embodiment, the through holes 7 are disposed on the wall surfaces on the left and right sides of the mixing inner tube 6, respectively, toward the air inlet 3 and the air outlet 4, and the through holes 7 on the left side are located above the opening 10.
As a preferable scheme of the embodiment, the through holes 7 are more than two groups of vertical holes, the aperture size of the through holes 7 is 5mm, and the aperture ensures that the waste gas smoothly flows through on one hand and the path of the air entering the mixing inner tube 6 is dispersed on the other hand.
As a preferable solution of this embodiment, the diameters of the mixing outer tube 2, the intermediate tube 5 and the mixing inner tube 6 are in a ratio of 3:2:1, so that a gap is ensured to be enough for the exhaust gas to flow smoothly.
As a preferable mode of the present embodiment, the mixing outer tube 2, the intermediate tube 5 and the mixing inner tube 6 are integrally formed, the installation of parts is reduced, and the mixing outer tube 2, the intermediate tube 5 and the mixing inner tube 6 are combined in advance to form a required structural member, and the mixing outer tube can be installed in the cylinder 1. Of course, in other embodiments, the mixing outer tube 2, the intermediate tube 5 and the mixing inner tube 6 may be formed separately, mounted separately, or formed by welding.
As the preferable scheme of the embodiment, the silk screen 11 is formed by pressing at least two layers of staggered woven stainless steel wires, the multi-layer stainless steel wire net 11 is of a multi-layer steel wire net structure, each layer can be formed into small holes by staggered weaving of stainless steel wires at 90 degrees, the small holes are standard squares, the shapes of the small holes are fixed, the structure is stable, and compared with the steel wool scheme in the current market, the production consistency is good.
As a preferred solution of this embodiment, the wire mesh 11 is connected to the bottom of the inner tube 5 by brazing, and the wire mesh 11 and the intermediate tube 5 may be formed as a whole by welding and then directly mounted on the cylinder 1.
While the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (1)
1. The utility model provides a diesel engine aftertreatment high-efficient blender, includes barrel (1), the both ends of barrel (1) are provided with air inlet (3), gas outlet (4) respectively, its characterized in that: a mixing outer tube (2), a middle tube (5) and a mixing inner tube (6) are coaxially arranged in the cylinder body (1) in sequence from outside to inside, wherein the axis of the mixing outer tube is vertical to the axis of the mixing inner tube; the middle pipe (5) and the mixing inner pipe (6) are respectively arranged at two ends of the mixing outer pipe (2), the tail end of the mixing inner pipe (6) extends into the tail end of the middle pipe (5), and gaps are formed among the mixing outer pipe (2), the middle pipe (5) and the mixing inner pipe (6); an opening (10) for communicating a gap between the mixing outer tube (2) and the middle tube (5) is arranged on the side wall of the lower part of the mixing outer tube (2), and the opening (10) is communicated with the air inlet (3); a swirl plate (8) is arranged in a gap between the middle pipe (5) and the mixing inner pipe (6), and a through hole (7) is formed in the wall surface of the mixing inner pipe (6) corresponding to the upper part of the middle pipe (5); the urea spraying device is characterized in that a urea nozzle (9) for spraying urea into the mixing inner pipe (6) is arranged on the cylinder body (1), a silk screen (11) is arranged at the bottom of the middle pipe (5), a channel communicated with the air outlet (4) is arranged below the mixing outer pipe (2), and the silk screen (11) is positioned above the channel; the through holes (7) are arranged on the wall surfaces of the left side and the right side of the mixing inner tube (6) and respectively face the air inlet (3) and the air outlet (4), and the through holes (7) on the left side are positioned above the opening (10); the through holes (7) are arranged as more than two groups of vertical holes, and the aperture size of the through holes (7) is 3-10 mm; the diameter ratio of the mixing outer tube (2), the middle tube (5) and the mixing inner tube (6) is 3:2:1; the mixing outer tube (2), the middle tube (5) and the mixing inner tube (6) are integrated into a whole; the silk screen (11) is formed by pressing at least two layers of staggered woven stainless steel wires; the wire mesh (11) is connected with the bottom of the middle pipe (5) through brazing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010759592.0A CN111963281B (en) | 2020-07-31 | 2020-07-31 | High-efficient blender of diesel engine aftertreatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010759592.0A CN111963281B (en) | 2020-07-31 | 2020-07-31 | High-efficient blender of diesel engine aftertreatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111963281A CN111963281A (en) | 2020-11-20 |
| CN111963281B true CN111963281B (en) | 2024-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010759592.0A Active CN111963281B (en) | 2020-07-31 | 2020-07-31 | High-efficient blender of diesel engine aftertreatment |
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| Country | Link |
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| CN (1) | CN111963281B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961935A (en) * | 2022-07-04 | 2022-08-30 | 潍柴动力股份有限公司 | Preheat urea injection structure and aftertreatment device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207686808U (en) * | 2017-12-23 | 2018-08-03 | 无锡威孚力达催化净化器有限责任公司 | Side post-processes urea mixing device into nozzle integrated form SCR |
| CN109653849A (en) * | 2019-01-28 | 2019-04-19 | 凯龙高科技股份有限公司 | A kind of urea injection bimetallic tube mixer for diesel engine vent gas post-processing |
| CN210460814U (en) * | 2019-08-26 | 2020-05-05 | 凯龙高科技股份有限公司 | A cylinder compact blender for diesel engine tail gas treatment |
| CN111140324A (en) * | 2020-01-20 | 2020-05-12 | 广西玉柴机器股份有限公司 | Diesel engine aftertreatment blender |
| CN212671903U (en) * | 2020-07-31 | 2021-03-09 | 广西玉柴机器股份有限公司 | Efficient mixer for diesel engine aftertreatment |
-
2020
- 2020-07-31 CN CN202010759592.0A patent/CN111963281B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207686808U (en) * | 2017-12-23 | 2018-08-03 | 无锡威孚力达催化净化器有限责任公司 | Side post-processes urea mixing device into nozzle integrated form SCR |
| CN109653849A (en) * | 2019-01-28 | 2019-04-19 | 凯龙高科技股份有限公司 | A kind of urea injection bimetallic tube mixer for diesel engine vent gas post-processing |
| CN210460814U (en) * | 2019-08-26 | 2020-05-05 | 凯龙高科技股份有限公司 | A cylinder compact blender for diesel engine tail gas treatment |
| CN111140324A (en) * | 2020-01-20 | 2020-05-12 | 广西玉柴机器股份有限公司 | Diesel engine aftertreatment blender |
| CN212671903U (en) * | 2020-07-31 | 2021-03-09 | 广西玉柴机器股份有限公司 | Efficient mixer for diesel engine aftertreatment |
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| CN111963281A (en) | 2020-11-20 |
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